Figure 3
(a) Temporal evolution of the XRD spectra of n = ∞ perovskite films thermally aged at 85 °C in dark and in inert atmosphere for the period indicated (the pristine film was measured before ageing); (b) ratio between the PbI2 diffraction peak (2θ = 12.7°) and the main perovskite diffraction peak (2θ = 14.2°) intensities for 3D, mixed dimensional, and 2D perovskite films. (c) Pristine and aged n = ∞ Transmittance (T) spectra measured by a Fourier Transformed Infrared-Attenuated Total Reflectance (FTIR-ATR); d) relative transmittance change, ∆T/T of n = ∞, 60, 40 perovskite films after ageing for 4 hrs at 85 °C.
